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Solar
Trans-Neptunian object

666739

666739 (2010 TS191)

Where is it now

Distance from Sun
28.641 AU
True anomaly
2.75°
Distance from Earth
28.223 AU
As of
2 October 2026

Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.

Sun Earth — 1.001 AU from the Sun Earth 666739 — 28.641 AU from the Sun 666739
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 666739 is 28.223 AU from Earth today (3.9 light-hours).

In the sky

Right ascension
05h 00m 02s
Declination
+17° 10′ 36″
Constellation
Taurus
Distance from Earth
28.21 AU
Elongation from the Sun
114.46° — well clear of the Sun

Favours the northern hemisphere; low or below the horizon from far south.

From your location

See how high it is right now, whether it's up after dark, and when it rises and sets where you are.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.

Orbital elements

Semi-major axis
30.181 AU
Eccentricity
0.0511
Inclination
6.56°
Orbital period
165.8 years
Perihelion
28.64 AU
Aphelion
31.723 AU
Longitude of ascending node
129.65°
Argument of periapsis
301.21°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 10,763.8 LD
27.6582 AU
Tisserand (Jupiter)
4.951

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
196
Data arc
23.17 years
First observed
2 October 2000
Last observed
4 December 2023
Residual RMS
0.56 ″
Solution · Otto Matic
16 April 2024

Visual & observation

Absolute magnitude (H)
8.06

Discovery & classification

Discovered by
Pan-STARRS 1
Discovery date
7 October 2010
Discovery site
Haleakala

Also known as 2010 TS191

TNO

Sources